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What is composed of masses of nerve cells, with fibers, running upward and downward;

it originates in the brain and extends to the length of the trunk
a. Central nervous system
b. Peripherial nerves
c. Spinal cord
d. Parasympathetic systems

User Dave Isaacs
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1 Answer

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19 votes

Answer:

B. Peripheral nerves

Step-by-step explanation:

Peripheral nerves use bundles of nerve fibers (axons) to send information around the central nervous system.

User Ken Wilcox
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